Mounting.



r. A. STEVENS.

MOUNTING.

APPLICATION man our. 13. 1917.

Patented Aug. 6, 1918.

iii 07 72 e UNITED STATES PATENT OFFICE.

FREDERICK A. STEVENS, 0 F PROVIDENCE, RHODE ISLAND, ASSIGNOR TO STEVENSAND COMPANY, INCORPORATED, A CORPORATION OF RHODE ISLAND.

MOUNTING.

Specification of Letters Patent.

Patented Aug. 6, 1918.

Application filed October 13, 1917. Serial No. 196,518.

T 0 all whom it may concern:

Be it known that I, Fnnnnmcu A. STEVENS, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland,.have invented certain new and useful Improve ments in Mountings,of which the following is a specification.

My invention relates to mountings of the finger piece type foreyeglasses and spectacles.

In this type of mountings it is desirable, in order to distribute thestrain and avoid excessive wear, that there bea substantial bearing areaof the lever arm upon the relatively fixed pivot member or post. Forthis reason an axial tube 'or sleeve, formed on the arm, surrounds theentire-length of the 'pivot member. This has provedunsatisfactorybecause the upper coilor coils of the helical actuatingspring which .er'nbrace the sleeve are worn and weakened by theoscillation of the sleeve when the arm, to which the movable end of thespring is attached, is vibrated. Furthermore the upper sprin coil, whichwas nearest the fixed end of t e spring exerted such pressure againstthe sleeve that the movement of the latter tended to bind or to exhaustand derange the spring after much use.

The essential objects of my invention are to overcome the enumerateddisadvantages and to attain in a single structure the advantages of anextended lever bearing without injury to the hearing or to the s ring;also to insure a smooth and unimpeded 0scillation of the lever; and toattain these ends in an inexpensive structure embodying a minimum ofparts.

In the accompanying drawings which form a part of this specification,

Figure 1 is a front elevation of a pair of eyeglasses embodying myinvention,

Flg. 2, a plan view of the device,

Fig. 3, an enlarged section on line 3-3 of Fig. 2, and

Fig. 4, a similar section on line 4:4: of Fig. 3.

Like reference characters indicate like parts throughout the views.

In the form of my invention herein shown 5 represents the lenses, 6 thebridge or nose piece, 7 the flattened supports or bridge end portions, 8the straps, 9 the lugs, and 10 the lens attaching screws of a pair ofeyeglasses or spectacles. In conjunction with these parts are theoperatin levers 12 having the finger portions 13 an nose guard portions14. upon their respective ends. The intermediate portion of each lercrhas an opening 16 bounded by a vertical tube or sleeve 17.

Each end portion 7 of the bridge has a threaded opening 19 to receivethe threads 21 of the reduced end 22 of a post having a body or shankportion 2 1 of reatcr diameter, forming a resulting shou der 25 whichabuts a ainst the upper face of the support. l he upper portion 26 ofthe post is of enlarged diameter forming an annular shoulder whose lowerface slidably engages a flat ring 27 loose on the post and resting uponthe upper end of the tube 17 which a so surrounds the portion 24 of thepost. The diameter of the shoulder 26 is of such dimension that itsperiphery is continuous with that of the outer faces of the ring andtube. On top of the shoulder 26 is a laterally extending circular head28 provided in this instance with a slot 29 to receive a screw driver.

The actuating spring 30 is helical in form, comprising a plurality ofsuperposed coils. The upper coil or coils 31 thereof embraces the cyindrical shoulder 26 and the remaining coils 32 loosely surround thering 27 and sleeve 17 of the guard. Continuous with the upper coil ofthe spring is the rearwardly directed arm or end 34 whose bent endpresses against the rear of the adjacent strap 8. The lowermost of thecoils 32 rests upon the lever 12 and is continued rearwardly to form anarm 36 whose end 37 is laterally bent to engage the rear portion of thelever arm 12.

The eflect of each sprin 30 is to press the lards 14 inwardly tower eachother upon t e nose of the wearer, and release of the lards is attainedby manually compressing t e finger portions 13 of the levers. The springarm 34 is relatively stationary, and t e arm 36 is radially movable. Itwill be observed therefore, that the uppermost coil 31 is the one whichis most violently or strongly engaged with its surrounded member. Thatis to say the post presses most intensely upon the coil at or adjacentthe point 40, as shown in Fig. 4, whenever the lever 12 is operated.This tension or grip, therefore, is exerted on the stationary memorwearing action uponthegspliing, but also.

no impediment to the oscillatory movement of the sleeve. Durlng stresson the spring there is 301110 frictional contact of the lower coils 32with, the ringer. sleeve, as shown in broken lines in Fig. 3.hevfriqtiql rbetween the spring and sleeve is essened by t 10 preseneo fthe ring in conjnnctipp, with the, l e e. 1" a d the verveea eemt 1:ream} t 'ecdo n- Ha s t e e c i ed W i ii lw ive e hqgli men t'of myinvention, it is mglergtqml that she, specifip terms employe are ,used,in oscriptive sense only, aml are not IEQII the purpose of limitation,the scope oi the inreat on be i g defined l) C 3. 1

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